Dovetailed staver for bulged barrels and caskets



. March 26,1929. E. A. BQLINDER DQVETAILED STAVE FOR BULGED BARRELS AND GASKETS Filed Aug. 21, 1925 Fatented Mar. 26, 1929.

. UNITED STATES- PATENT: OFFICE.

EBIK'AUGUST BOLINDER, or STOCKHOLM, swarm-i.

DOVETAILED SIAVE FOR BULGED BARRELS AND GASKETS.

Application filed August 21,'1925, Seria1 No. 51,716, and in Sweden June 14, 1924.

I have filed applications for patent in Sweden June 14;, 1924; Germany June 12, 1925; Finland June 9, 1925; Great Britain June 13, 1925; Switzerland June 13, 1925; Spain June 13,1925; Italy June 1.3, 1925 and France June 17, 1925.

In making bulged barrels and caskets having dovetailed staves, a method has been used in which the parts of the joint, that TS to say the groove provided in the one edge of the stave and the tongue provided on the opposite edge of the stave have been formed on the lines of circular arcs, so as to permit the parts of the joint of being slid onto each other in the longitudinal direction thereof.

The present invention has for its'purpose to provide such a construction of the parts of the joint that their position relatively to the outside and the inside of the stave will be the most suitable with respect to a number of practical points of view.

The arrangement according to the 1nvention is principally characterized by the fact that the parts of the joint extending after circular arcs are disposed in relation to the outside and the inside of the stave in such manner that the parts of the joint are situated, at the central portion of the stave, ata

greater distance from the outside of the stave than from the inside thereof. Moreover, the ends of the parts of the joint are at a greater distance from the inside of the stave than is the central portion of the stave.

By this arrangement the great advantage is attainedthat the staves may be produced of the common shape, which experience has shown is the most suitable for bulged barrels and casks, that is to say, the bulge proper may be provided at the central portion of the staves, while the end portions thereof are made straight or nearly straight. the end portions of the cask outside the bulged middle portion will, therefore, be conical or nearly conical in known manner, and the hoops provided about these portions may be driven inwardly onto the cask in known manner, without the tight fit of the hoops on the conical surfaces being altered.

By the fact that the parts of the joint are at the central portion of the staves situated at a greater distance from the outside of the.

stave than from the inside thereof, the portion of the cask which is most subjected to wear inrolling the cask will be reinforced, and by the ends of the parts of the joint being at a greater distance from the inside of the stave than from the; outside thereof,

ample material will be obtained for making u 1 v i The arrangement 18 illustrated in the-ac rigid crozes in the staves.

companying drawing. Fig. 1 shows a longitudinal section of the stave and Fig. 2 a cross section thereof, on the line er -a in Fig. 1.

The parts of the joint, that is to say the groove 1 and the tongue 2 are formed on the lines of circular arcs. The distance 3 between the middle points of the parts of the joint and the outside of the stave is appreciably greater than the distance 4 from the inside, and at the ends the distance 5 between the parts of the joint and the inside is greater than the distance 6 from the outside. At the central portion of the stave, a sufficient amount of material will thus remain to withstand outside wear when the cash is rolled,'and at the ends there will, likewise, be ample material for making the crozes 7.

The edges of the parts 1 and 2 ofthe joint do not parallel each other, that is to say, they are not mutually concentric, but

eccentric, that is to say tapering in'a wedgelike fashion toward the one end. Thisarrangement brings about the special advantage that the parts of the joint may he slid onto each other along the major portion of their length, without appreciable friction orbreaking strains being caused thereby, which, on the other hand, will be the case if the edges of the parts parallel one another. Only after the wedge-like parts of the joint have been slid onto each other along the is brought with its ends to the same dis-'- tance from the inside of the stave, while the ends of the outer edge of the part are brought to different distances from the said inside of the stave. This entails the advan tage thatthe material for the crozes 7 will be the same at both ends while also the manufacture will be more easy, in that only one of the cutters used for cutting the groove requires to be movable during work in the direction of the radius of the out edge.

What I claim as new and desire to secure by Letters Patent of the United States of America is 1. A barrel including a plurality of staves having bulged medial portion-s and substantially straight end portions continuing from the medial portions, the inner surfaces of the end portions of the staves being recessed, jointing means arranged along the edges of adjacent staves and situated substantially on 15 an imaginary arc of a circle of a reater radii than the barrel staves and positioned in close proximity of the inner surface of the medial portion of the staves and in close proximity to the outer surface of the outer portions of the staves, substantially as and for the purposes set forth.

2. An arrangement as claimed in claiml, wherein the side edges of the joints taper slightly in wedge-like fashion from one end 25 towards the other.

In testimony whereof I afiix my signature.

ERIK AUGUST BOLINDER. 

